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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.math.analysis.interpolation;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import org.apache.commons.math.MathException;<a name="line.19"></a>
<FONT color="green">020</FONT>    import org.apache.commons.math.analysis.MultivariateRealFunction;<a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.commons.math.exception.NotPositiveException;<a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.commons.math.exception.NotStrictlyPositiveException;<a name="line.22"></a>
<FONT color="green">023</FONT>    import org.apache.commons.math.random.UnitSphereRandomVectorGenerator;<a name="line.23"></a>
<FONT color="green">024</FONT>    <a name="line.24"></a>
<FONT color="green">025</FONT>    /**<a name="line.25"></a>
<FONT color="green">026</FONT>     * Interpolator that implements the algorithm described in<a name="line.26"></a>
<FONT color="green">027</FONT>     * &lt;em&gt;William Dudziak&lt;/em&gt;'s<a name="line.27"></a>
<FONT color="green">028</FONT>     * &lt;a href="http://www.dudziak.com/microsphere.pdf"&gt;MS thesis&lt;/a&gt;.<a name="line.28"></a>
<FONT color="green">029</FONT>     * @since 2.1<a name="line.29"></a>
<FONT color="green">030</FONT>     *<a name="line.30"></a>
<FONT color="green">031</FONT>     * @version $Revision: 980944 $ $Date: 2010-07-30 22:31:11 +0200 (ven. 30 juil. 2010) $<a name="line.31"></a>
<FONT color="green">032</FONT>     */<a name="line.32"></a>
<FONT color="green">033</FONT>    public class MicrosphereInterpolator<a name="line.33"></a>
<FONT color="green">034</FONT>        implements MultivariateRealInterpolator {<a name="line.34"></a>
<FONT color="green">035</FONT>    <a name="line.35"></a>
<FONT color="green">036</FONT>        /**<a name="line.36"></a>
<FONT color="green">037</FONT>         * Default number of surface elements that composes the microsphere.<a name="line.37"></a>
<FONT color="green">038</FONT>         */<a name="line.38"></a>
<FONT color="green">039</FONT>        public static final int DEFAULT_MICROSPHERE_ELEMENTS = 2000;<a name="line.39"></a>
<FONT color="green">040</FONT>    <a name="line.40"></a>
<FONT color="green">041</FONT>        /**<a name="line.41"></a>
<FONT color="green">042</FONT>         * Default exponent used the weights calculation.<a name="line.42"></a>
<FONT color="green">043</FONT>         */<a name="line.43"></a>
<FONT color="green">044</FONT>        public static final int DEFAULT_BRIGHTNESS_EXPONENT = 2;<a name="line.44"></a>
<FONT color="green">045</FONT>    <a name="line.45"></a>
<FONT color="green">046</FONT>        /**<a name="line.46"></a>
<FONT color="green">047</FONT>         * Number of surface elements of the microsphere.<a name="line.47"></a>
<FONT color="green">048</FONT>         */<a name="line.48"></a>
<FONT color="green">049</FONT>        private int microsphereElements;<a name="line.49"></a>
<FONT color="green">050</FONT>    <a name="line.50"></a>
<FONT color="green">051</FONT>        /**<a name="line.51"></a>
<FONT color="green">052</FONT>         * Exponent used in the power law that computes the weights of the<a name="line.52"></a>
<FONT color="green">053</FONT>         * sample data.<a name="line.53"></a>
<FONT color="green">054</FONT>         */<a name="line.54"></a>
<FONT color="green">055</FONT>        private int brightnessExponent;<a name="line.55"></a>
<FONT color="green">056</FONT>    <a name="line.56"></a>
<FONT color="green">057</FONT>        /** Create a microsphere interpolator with default settings.<a name="line.57"></a>
<FONT color="green">058</FONT>         * &lt;p&gt;Calling this constructor is equivalent to call {@link<a name="line.58"></a>
<FONT color="green">059</FONT>         * #MicrosphereInterpolator(int, int)<a name="line.59"></a>
<FONT color="green">060</FONT>         * MicrosphereInterpolator(MicrosphereInterpolator.DEFAULT_MICROSPHERE_ELEMENTS,<a name="line.60"></a>
<FONT color="green">061</FONT>         * MicrosphereInterpolator.DEFAULT_BRIGHTNESS_EXPONENT)}.&lt;/p&gt;<a name="line.61"></a>
<FONT color="green">062</FONT>         */<a name="line.62"></a>
<FONT color="green">063</FONT>        public MicrosphereInterpolator() {<a name="line.63"></a>
<FONT color="green">064</FONT>            this(DEFAULT_MICROSPHERE_ELEMENTS, DEFAULT_BRIGHTNESS_EXPONENT);<a name="line.64"></a>
<FONT color="green">065</FONT>        }<a name="line.65"></a>
<FONT color="green">066</FONT>    <a name="line.66"></a>
<FONT color="green">067</FONT>        /** Create a microsphere interpolator.<a name="line.67"></a>
<FONT color="green">068</FONT>         * @param microsphereElements number of surface elements of the microsphere.<a name="line.68"></a>
<FONT color="green">069</FONT>         * @param brightnessExponent exponent used in the power law that computes the<a name="line.69"></a>
<FONT color="green">070</FONT>         * weights of the sample data.<a name="line.70"></a>
<FONT color="green">071</FONT>         * @throws NotPositiveException if {@code microsphereElements &lt;= 0}<a name="line.71"></a>
<FONT color="green">072</FONT>         * or {@code brightnessExponent &lt; 0}.<a name="line.72"></a>
<FONT color="green">073</FONT>         */<a name="line.73"></a>
<FONT color="green">074</FONT>        public MicrosphereInterpolator(final int microsphereElements,<a name="line.74"></a>
<FONT color="green">075</FONT>                                       final int brightnessExponent) {<a name="line.75"></a>
<FONT color="green">076</FONT>            setMicropshereElements(microsphereElements);<a name="line.76"></a>
<FONT color="green">077</FONT>            setBrightnessExponent(brightnessExponent);<a name="line.77"></a>
<FONT color="green">078</FONT>        }<a name="line.78"></a>
<FONT color="green">079</FONT>    <a name="line.79"></a>
<FONT color="green">080</FONT>        /**<a name="line.80"></a>
<FONT color="green">081</FONT>         * {@inheritDoc}<a name="line.81"></a>
<FONT color="green">082</FONT>         */<a name="line.82"></a>
<FONT color="green">083</FONT>        public MultivariateRealFunction interpolate(final double[][] xval,<a name="line.83"></a>
<FONT color="green">084</FONT>                                                    final double[] yval)<a name="line.84"></a>
<FONT color="green">085</FONT>            throws MathException, IllegalArgumentException {<a name="line.85"></a>
<FONT color="green">086</FONT>            final UnitSphereRandomVectorGenerator rand<a name="line.86"></a>
<FONT color="green">087</FONT>                = new UnitSphereRandomVectorGenerator(xval[0].length);<a name="line.87"></a>
<FONT color="green">088</FONT>            return new MicrosphereInterpolatingFunction(xval, yval,<a name="line.88"></a>
<FONT color="green">089</FONT>                                                        brightnessExponent,<a name="line.89"></a>
<FONT color="green">090</FONT>                                                        microsphereElements,<a name="line.90"></a>
<FONT color="green">091</FONT>                                                        rand);<a name="line.91"></a>
<FONT color="green">092</FONT>        }<a name="line.92"></a>
<FONT color="green">093</FONT>    <a name="line.93"></a>
<FONT color="green">094</FONT>        /**<a name="line.94"></a>
<FONT color="green">095</FONT>         * Set the brightness exponent.<a name="line.95"></a>
<FONT color="green">096</FONT>         * @param exponent Exponent for computing the distance dimming<a name="line.96"></a>
<FONT color="green">097</FONT>         * factor.<a name="line.97"></a>
<FONT color="green">098</FONT>         * @throws NotPositiveException if {@code exponent &lt; 0}.<a name="line.98"></a>
<FONT color="green">099</FONT>         */<a name="line.99"></a>
<FONT color="green">100</FONT>        public void setBrightnessExponent(final int exponent) {<a name="line.100"></a>
<FONT color="green">101</FONT>            if (exponent &lt; 0) {<a name="line.101"></a>
<FONT color="green">102</FONT>                throw new NotPositiveException(exponent);<a name="line.102"></a>
<FONT color="green">103</FONT>            }<a name="line.103"></a>
<FONT color="green">104</FONT>            brightnessExponent = exponent;<a name="line.104"></a>
<FONT color="green">105</FONT>        }<a name="line.105"></a>
<FONT color="green">106</FONT>    <a name="line.106"></a>
<FONT color="green">107</FONT>        /**<a name="line.107"></a>
<FONT color="green">108</FONT>         * Set the number of microsphere elements.<a name="line.108"></a>
<FONT color="green">109</FONT>         * @param elements Number of surface elements of the microsphere.<a name="line.109"></a>
<FONT color="green">110</FONT>         * @throws NotStrictlyPositiveException if {@code elements &lt;= 0}.<a name="line.110"></a>
<FONT color="green">111</FONT>         */<a name="line.111"></a>
<FONT color="green">112</FONT>        public void setMicropshereElements(final int elements) {<a name="line.112"></a>
<FONT color="green">113</FONT>            if (elements &lt;= 0) {<a name="line.113"></a>
<FONT color="green">114</FONT>                throw new NotStrictlyPositiveException(elements);<a name="line.114"></a>
<FONT color="green">115</FONT>            }<a name="line.115"></a>
<FONT color="green">116</FONT>            microsphereElements = elements;<a name="line.116"></a>
<FONT color="green">117</FONT>        }<a name="line.117"></a>
<FONT color="green">118</FONT>    }<a name="line.118"></a>




























































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